Consider a distributed file system that uses per-user name spaces. In other words, each user has his own, private name space. Can names from such name spaces be used to share resources between two different users?
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- Consider user accounts on a computer system with a Web server configured to provide user Web areas. In general, this uses a standard directory name, such as “public_html,” in a user’s home directory. However, access control needs to be properly set to allow users (with or without user accounts on the system) to browse the webpages. Assuming there are one main page (index.html), two pictures files (a.jpg and b.jpg) stored in an sub-directory (Image) and one pdf file (c.pdf) stored in an sub-directory (Doc), all under the public_html. Specify the access control for each directory and files that allows everyone to view the webpage.Consider user accounts on a computer system with a Web server configured to provide user Web areas. In general, this uses a standard directory name, such as “public_html,” in a user’s home directory. However, access control needs to be properly set to allow users (with or without user accounts on the system) to browse the webpages. Assuming there are one main page (index.html), two pictures files (a.jpg and b.jpg) stored in an sub-directory (Image) and one pdf file (c.pdf) stored in an sub-directory (Doc), all under the public_html. (a) Specify the access matrix for each directory (excluding home directory) and files that allows everyone to view the webpage. (b) Draw a directed graph that represented to the access matrixQuestion: The purpose of this project is to design and implement a distributed storage system. The system's architecture is inspired bythe abstract architecture for distributed file systems. Among the components, we have a client and multiple instances of a server. We adopt an asynchronous peer-to-peerreplication among the server instances with a replication factor of three. The system supports two operations: read and writeobjects. Each object is represented in a JSON format and stored in a local file for each instance of the server. Note that the fileshave a limited size of 30 MB. As well each object has a key (a string) attached to it. Finally, we use Kafka as a middlewarebetween the client and the server(s) To write an object, the JSON content and the key are sent to the server through Kafka. When the write operation succeeds, theclient receives an acknowledgement from each server. A write operation with an existing key replaces the existing object.Moreover, the client sends a…
- Suppose that you have a UNIX file system where the disk block size is 4096 bytes. Disk addresses and file block pointers take 32 bits (4 bytes), and the i-node contains 12 direct pointers, one single-indirect pointer and one double-indirect pointer. Assume an index block is the same size as a data block (both 4096 Bytes). If there is a file having 50,000 bytes of data and it is never been accessed, we only assume the file's i-node is in memory, but none of the rest of the file. If the user process wants to access to read the entire file into the memory, how many I/O operations would be needed? O a. 15 O b. 12 O c. 14 O d. 13Q: Consider a distributed object-based system that supports object replication, in which all method invocations are totally ordered. Also, assume that an object invocation is atomic (e.g., because every object is automatically locked when invoked). Does such a system provide entry consistency? What about cemential consistency)Consider a memory system which only allows you to do sequential search. For example a read/write tapedrive. If you want to look for a file you have to search sequentially looking at the first file, then the secondfile and so on until you find the file. A reasonable strategy would be place the most recently retrieved fileat the front (imagine that the tape system can magically do this). This way the files that are accessed moreoften will be ”at the front” and require less searching time in the long run. Consider the case with only 3files A, B, and C.1. Let Xn denote the sequence of the memory system after the nth search. For example, if the files wereordered A and then B followed by C, then X0 = ABC. Enumerate the state space.2. If X0 = ABC, list all possible states of X1.3. If pA, pB, and pC = 1 − pA − pB are the probabilities with which files A, B, and C are accessed,respectively, determine the one-step state transition matrix.4. If pA = 0.6, pB = 0.10, pC = 0.3, determine the steady…
- You can use URLs to access information on the Web from within Java programmes. (uniform resource locators). MindSlave software programmers (working on their new NetPotato browser) want to maintain track of a potentially enormous bookmark list of frequently visited URLs. It would be ideal if they could have arbitrary access to the values saved in the list. Is a List a suitable data structure? (Tip: If not, why not?)Suppose that a disk drive has 6,000 cylinders, numbered 0 to 5999. The drive is currently serving a request at cylinder 3797, and the previous request was at cylinder 1375. The queue of pending requests, in FIFO order, is: 1589, 5474, 2104, 1350, 4336, 3678, 1697, 1780, 3794, 3982, 2508 Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following disk-scheduling algorithms? Show the calculation result Show the sequence of the position of the head and calculation steps 1. SSTF 2. SCANConsider a system where free space is kept in a free-space list. a. Suppose that the pointer to the free-space list is lost. Can the system reconstruct the free-space list? Explain your answer. b. Consider a file system similar to the one used by UNIX with indexed allocation. How many disk 1/0 operations might be required to read the contents of a small local file at /a/b/c? Assume that none of the disk blocks is currently being cached. c. Suggest a scheme to ensure that the pointer is never lost as a result of memory failure.
- Write in g++ Design and implement a simple, interactive shell program that prompts the user for a command, parses the command, and then executes it with a child process. In your solution you are required to use execv(), which means that you will have to read the PATH environment, then search each directory in the PATH for the command file name that appears on the command line.A ring buffer, or circular queue, is a FIFO data structure of a fixed size N. It is useful for transferring data between asynchronous processes or for storing log files. When the buffer is empty, the consumer waits until data is deposited; when the buffer is full, the producer waits to deposit data. Develop an API for a RingBuffer and an implementation that uses an array representation (with circular wrap-around)Consider a file system that uses contiguous allocation method. For a disk consists of 100 data blocks, each block is 4KB. What is the maximum and minimum number of files of size 15KB can it save? Find the number of files the disk able to support using (1) link allocation and (2) index allocation, assuming the address is 32 bit.